<template>
  <div>
    <!-- 面包屑 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>商品分类</el-breadcrumb-item>
    </el-breadcrumb>

    <!-- 卡片区域 -->
    <el-card>
      <el-row>
        <el-col>
          <el-button type="primary" @click="showAddCateDialog"
            >添加分类</el-button
          >
        </el-col>
      </el-row>

      <!-- 表格 -->
      <tree-table
        class="treeTable"
        :data="cateList"
        :columns="columns"
        :selection-type="false"
        :expand-type="false"
        :show-index="true"
        index-text="#"
        :border="true"
        :show-row-hover="false"
      >
        <!-- 是否有效 -->
        <template v-slot:isOk="{ row }">
          <i
            class="el-icon-success"
            v-if="row.cat_deleted === false"
            style="color: lightgreen"
          ></i>
          <i class="el-icon-error" v-else style="color: red"></i>
        </template>
        <!-- 排序 -->
        <template v-slot:order="{ row }">
          <el-tag size="mini" v-if="row.cat_level === 0">一级</el-tag>
          <el-tag type="success" size="mini" v-else-if="row.cat_level === 1"
            >二级</el-tag
          >
          <el-tag type="warning" size="mini" v-else>三级</el-tag>
        </template>
        <!-- 操作 -->
        <template v-slot:option="{ row }">
          <el-button
            size="mini"
            type="primary"
            icon="el-icon-edit"
            @click="showEditCateDialog(row.cat_id)"
            >编辑</el-button
          >
          <el-button
            size="mini"
            type="danger"
            icon="el-icon-delete"
            @click="showRemoveCateDialog(row.cat_id)"
            >删除</el-button
          >
        </template>
      </tree-table>

      <!-- 分页区 -->
      <el-pagination
        @size-change="handleSizeChange"
        @current-change="handleCurrentChange"
        :current-page="querInfo.pagenum"
        :page-sizes="[3, 5, 10, 15]"
        :page-size="querInfo.pagesize"
        layout="total, sizes, prev, pager, next, jumper"
        :total="total"
      >
      </el-pagination>
    </el-card>

    <!-- 添加分类的对话框 -->
    <el-dialog
      title="添加分类"
      :visible.sync="addCateDialogVisible"
      width="50%"
      @close="addCateFormClosed"
    >
      <!-- 添加分类的表单 -->
      <el-form
        :model="addCateForm"
        :rules="addCateFormRules"
        ref="addCateFormRef"
        label-width="100px"
      >
        <el-form-item label="分类名称" prop="cat_name">
          <el-input v-model="addCateForm.cat_name"></el-input>
        </el-form-item>
        <el-form-item label="父级分类">
          <el-cascader
            v-model="selectedKeys"
            :options="parentCateList"
            :props="{
              expandTrigger: 'hover',
              ...cascaderProps,
            }"
            @change="parentCateChanged"
            clearable
          ></el-cascader>
        </el-form-item>
      </el-form>

      <span slot="footer" class="dialog-footer">
        <el-button @click="addCateDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="addCate">确 定</el-button>
      </span>
    </el-dialog>

    <!-- 编辑分类 -->
    <el-dialog
      title="分类编辑"
      :visible.sync="editCateDialogVisible"
      width="50%"
    >
      <!-- 主体内容 -->
      <el-form
        :model="editCateForm"
        :rules="editCateFormRules"
        ref="editCateFormRef"
        label-width="100px"
      >
        <el-form-item label="分类名称" prop="cat_name">
          <el-input v-model="editCateForm.cat_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="editCateDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="editCatName">确 定</el-button>
      </span>
    </el-dialog>

    <!-- 删除分类 -->
    <el-dialog
      title="删除分类"
      :visible.sync="removeCateDialogVisible"
      width="50%"
    >
      <!-- 主体内容 -->
      <el-form
        :model="removeCateForm"
        ref="removeCateFormRef"
        label-width="100px"
      >
        <span>是否删除该分类</span>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="removeCateDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="removeCateById">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>

<script>
export default {
  name: "Cate",
  data() {
    return {
      //商品分类的数据列表，默认为空
      cateList: [],

      //总数据条数
      total: 0,

      //查询条件
      querInfo: {
        type: 3,
        pagenum: 1,
        pagesize: 5,
      },
      //为table指定列的定义
      columns: [
        {
          label: "分类名称",
          prop: "cat_name",
        },
        {
          label: "是否有效",
          //表示，将当前列定义为模板列
          type: "template",
          //表示当前这一列使用模板名称
          template: "isOk",
        },
        {
          label: "排序",
          //表示，将当前列定义为模板列
          type: "template",
          //表示当前这一列使用模板名称
          template: "order",
        },
        {
          label: "操作",
          //表示，将当前列定义为模板列
          type: "template",
          //表示当前这一列使用模板名称
          template: "option",
        },
      ],
      //控制添加分类对话框的显示与隐藏
      addCateDialogVisible: false,
      //控制编辑分类对话框的显示与隐藏
      editCateDialogVisible: false,
      //控制删除分类对话框的显示与隐藏
      removeCateDialogVisible: false,
      //添加分类的表单数据对象
      addCateForm: {
        //将要添加的分类名称
        cat_name: '',
        //分类的等级，默认要添加的是1级分类
        cat_level: 0,
        //父级分类的id
        cat_pid: 0,
      },
      //编辑分类的表单数据对象
      editCateForm: {},
      //删除分类的表单数据对象
      removeCateForm: {},
      //添加分类表单的验证规则
      addCateFormRules: {
        cat_name: [
          { required: true, message: "请输入分类名称", trigger: "blur" },
        ],
      },
      //编辑分类表单的验证规则
      editCateFormRules: {
        cat_name: [
          { required: true, message: "请输入分类名称", trigger: "blur" },
        ],
      },
      //父级分类的数据列表
      parentCateList: [],
      //指定级联选择器的配置对象
      cascaderProps: {
        value: "cat_id",
        label: "cat_name",
        children: "children",
      },
      //选中的父级分类的id数组
      selectedKeys: [],
    };
  },
  created() {
    this.getCateList();
  },
  methods: {
    //获取商品分类数据
    async getCateList() {
      const { data: res } = await this.$http.get("categories", {
        params: this.querInfo,
      });
      if (res.meta.status !== 200) {
        return this.$message.error("获取商品分类失败");
      } else {
        //把数据列表赋值给cateList
        this.cateList = res.data.result;
        //为总数据条数赋值
        this.total = res.data.total;
      }
    },
    //监听pagesize改变
    handleSizeChange(newSize) {
      this.querInfo.pagesize = newSize;
      this.getCateList();
    },
    //监听pagenum改变
    handleCurrentChange(newPage) {
      this.querInfo.pagenum = newPage;
      this.getCateList();
    },
    //点击按钮，展示添加分类的对话框
    showAddCateDialog() {
      //先获取父级分类数据再显示对话框
      this.getParentCateList();
      this.addCateDialogVisible = true;
    },
    //获取父级分类的数据列表
    async getParentCateList() {
      const { data: res } = await this.$http.get("categories", {
        params: { type: 2 },
      });
      if (res.meta.status !== 200) {
        return this.$message.error("获取父级分类数据失败");
      } else {
        this.parentCateList = res.data;
      }
    },
    //选中项发生变化触发这个函数
    parentCateChanged() {
      console.log(this.selectedKeys);
      //如果 selectedKeys 数组中的 length 大于0，证明选中的父级分类
      //反之，就说明没有选中任何父级
      if (this.selectedKeys.length > 0) {
        //父级分类的id
        this.addCateForm.cat_pid =
          this.selectedKeys[this.selectedKeys.length - 1];
        //为当前分类的等级赋值
        this.addCateForm.cat_level = this.selectedKeys.length;
      } else {
        //父级分类的id
        this.addCateForm.cat_pid = 0;
        //为当前分类的等级赋值
        this.addCateForm.cat_level = 0;
      }
    },
    //点击按钮添加分类
    addCate() {
      this.$refs.addCateFormRef.validate(async (valid) => {
        if (!valid) {
          return;
        } else {
          const { data: res } = await this.$http.post(
            "categories",
            this.addCateForm
          );
          if (res.meta.status !== 201) {
            return this.$message.error("添加分类失败");
          } else {
            this.$message.success("添加分类成功");
            this.getCateList();
            this.addCateDialogVisible = false;
          }
        }
      });
    },
    //监听对话框的关闭事件，重置表单数据
    addCateFormClosed() {
      this.$refs.addCateFormRef.resetFields();
      this.selectedKeys = [];
      this.addCateForm.cat_level = 0;
      this.addCateForm.cat_pid = 0;
    },
    //显示编辑分类的对话框
    showEditCateDialog() {
      this.editCateDialogVisible = true;
    },
    //展示编辑分类的对话框
    async showEditCateDialog(cat_id) {
      const { data: res } = await this.$http.get("categories/" + cat_id);
      if (res.meta.status !== 200) {
        return this.$message.error("查询用户信息失败");
      } else {
        this.editCateForm = res.data;
      }
      this.editCateDialogVisible = true;
    },
    //点击按钮修改分类名称
    editCatName() {
      this.$refs.editCateFormRef.validate(async (vaild) => {
        if (!vaild) {
          return this.$message.error("验证失败");
        } else {
          //发起修改用户信息的数据
          const { data: res } = await this.$http.put(
            "categories/" + this.editCateForm.cat_id,
            { cat_name: this.editCateForm.cat_name }
          );
          if (res.meta.status !== 200) {
            return this.$message.error("修改用户数据失败");
          } else {
            //关闭对话框
            this.editCateDialogVisible = false;
            //刷新列表
            this.getCateList();
            //提示修改成功
            this.$message.success("修改用户数据成功");
          }
        }
      });
    },
    //显示删除分类的对话框
    showRemoveCateById() {
      this.removeCateDialogVisible = true;
    },
    //展示删除分类的对话框
    async showRemoveCateDialog(cat_id) {
      const { data: res } = await this.$http.get("categories/" + cat_id);
      if (res.meta.status !== 200) {
        return this.$message.error("查询用户信息失败");
      } else {
        this.removeCateForm = res.data;
      }
      this.removeCateDialogVisible = true;
    },
    //点击按钮删除该分类
    async removeCateById() {
      const { data: res } = await this.$http.delete(
        "categories/" + this.removeCateForm.cat_id
      );
      if (res.meta.status !== 200) {
        return this.$message.error("删除分类失败");
      } else {
        this.getCateList();
        this.$message.success("删除分类成功");
        this.removeCateDialogVisible = false;
      }
    },
  },
};
</script>

<style scoped>
.treeTable {
  margin-top: 15px;
}
</style>